Amulet of Catapsi

This crimson-tinted metal amulet is rimmed with dozens of copper pyramids. It hums cheerfully when grasped.

When activated, this amulet emits a 30-foot radius area of telepathic noise, centered on, you, for 9 rounds. If any creature in this area (including you) attempts to manifest a power, it must succeed on a DC 17 Will save or pay 4 more points than it otherwise would for that power manifestation. The limit on the number of power points a subject can spend on a power remains in effect, so a creature that fails its saving throw might not be able to manifest its highest-level powers.